Bernard L. (from France) submitted this bubble chart for consideration. It accompanied an NYT article claiming the absence of evidence of election fraud. (Of course, as is well-known, absence of evidence is not the same as evidence of absence. Here, I'm purely interested in data presentation.)
As a seasoned consultant, Bernard asked if a Marimekko chart would be superior.
This is one ambitious chart. Ignoring the bubbles (which are more nuisance than anything), we are asked to interpret data at three different levels of aggregation in one go.
First, there were 95 cases classified into five indictment types. Second, these cases resulted in either convictions or acquittals/dismissals. Third, among the cases ending in convictions (the highlighted area), we were shown the occupations of those convicted.
By flattening three levels into one table, some key information is obscured. For example, how many cases resulted in conviction? The reader has to compute either 95-25 or 26+31+10+3. What percent of civil rights violation convictions were committed by party/campaign workers? It's not 2/3 = 67% (bottom row) but rather 2/2 = 100%.
The following junkart brings out the logic that is embedded in the complicated bubble-table. While there is a lot on the page, the text labels plus the flow directions allow readers to absorb the data one level at a time.
I have not attempted the Marimekko as I am not a fan of such charts. You're welcome to try.
Source: "In 5-Year Effort, Scant Evidence of Voter Fraud", New York Times, April 2007.
PS. I will be working through the backlog of reader submissions. Thanks for your patience. Keep them coming!
Remark (Apr 25 2007): Thanks to readers for keeping me honest (see comments below). The conviction rates shown previously were indeed the inverse. I have now fixed them.